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980MPa-grade automobile cold-rolled high-strength Q&P steel and production method thereof

A production method, 980mpa technology, applied in the field of iron and steel production, can solve the problems of reducing the surface quality of strip steel, achieve the effects of improving mechanical properties, inhibiting the precipitation of cementite, and high tensile strength

Active Publication Date: 2018-06-22
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, too high Si content will reduce the surface quality of the strip, and may also form olivine in the continuous casting process

Method used

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  • 980MPa-grade automobile cold-rolled high-strength Q&P steel and production method thereof
  • 980MPa-grade automobile cold-rolled high-strength Q&P steel and production method thereof
  • 980MPa-grade automobile cold-rolled high-strength Q&P steel and production method thereof

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Embodiment 1-12

[0020] Embodiment 1-12: The production process of the 980MPa grade automotive cold-rolled high-strength Q&P steel includes steelmaking, heating, hot rolling, cold rolling, continuous annealing and tempering processes. The specific steps of each process are as follows:

[0021] (1) Steelmaking process: molten steel is smelted in a converter, secondary refined in a vacuum furnace, and continuously cast to obtain a slab. The chemical composition and weight percentage of the slab are shown in Table 1.

[0022] (2) Heating process: heating by a walking heating furnace, the heating temperature in the soaking section is 1200-1350°C, and the total time in the furnace is ≥30min.

[0023] (3) Hot rolling process: the final rolling temperature is 870-910°C, and the coiling temperature is 660-710°C.

[0024] (4) Cold rolling process: cold rolling reduction rate ≥ 45%.

[0025] (5) Continuous annealing process: adopt continuous annealing furnace, soaking section holding temperature 770-8...

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Abstract

The invention discloses 980MPa-grade automobile cold-rolled high-strength Q&P steel and a production method thereof, and belongs to the technical field of steel production. The Q&P steel comprises thefollowing components, by weight percentage: 0.18-0.24% of C, 0.60-1.30% of Si, 1.60-2.40% of Mn, 0.02-0.04% of P, less than or equal to 0.005% of S, 0.040-0.070% of Nb, less than or equal to 0.0060%of N, 0.50-1.0% of Als and the balance of Fe and inevitable impurities. The production method comprises the steps of carrying out steel-making, carrying out heating, carrying out hot rolling, carryingout cold rolling, carrying out continuous annealing and carrying out leveling, wherein the holding temperature of a soaking zone in the continuous annealing process is 770-840 DEG C, and the holdingtemperature of an overaging zone is 300-440 DEG C. The obtained Q&P steel has the advantages that the mechanical property is excellent, the yield strength is greater than or equal to 550MPa, the tensile strength is greater than or equal to 980MPa, the elongation percentage is greater than or equal to 18%, and the cold forming property is good.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a 980MPa grade automobile cold-rolled high-strength Q&P steel and a production method thereof. Background technique [0002] The improvement of the strength of automotive steel is beneficial to reduce fuel consumption and pollutant emissions, while improving safety. Therefore, the development and research of high-strength automotive steel has always been one of the focuses in the field of steel material research. As one of the third-generation advanced high-strength steels, Q&P steels have both high strength and plasticity with the addition of a small amount of alloying elements, that is, better comprehensive mechanical properties, and thus have aroused widespread interest. Q&P steel was first proposed by Speer et al. The production process includes a quenching stage, a partitioning stage and a final cooling stage: the strip steel is quenched and coo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C21D1/26C21D8/02
CPCC21D1/26C21D8/0226C21D8/0236C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 郭志凯刘丽萍夏明生路博勋冯晓勇汪云辉刘靖宝田秀刚李梦龙
Owner TANGSHAN IRON & STEEL GROUP
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